Bigger stores will buy models with bigger TVs, shopkeepers of smaller stores will buy smaller ones. It's expensive. In addition, it's connected to broadband internet and you have to pay monthly fee. A PS3 in the kiosk has 160GB HDD and downloads demos. No small expenses.
Those 15.000 that Sony is shipping, I had thought they'd be paid for by Sony? You are saying that the shops are paying for them? I guess that kind of makes sense, but still ...
I have just today started with my plan of keeping track of how the shops present the games, how many have demo pods and of which systems, etc. The 360 right now isn't doing too good just yet, with no demo pods set up anywhere, even the one very bad one that I had found previously which was using an SDTV had disappeared ... the SDTV now hooked up to a GameCube ... lol.
Anyway, right at the end in a new shopping area that had just opened a few days ago I found a brand new toy-store that had a large gaming section. It had just closed, but I spied a HD TV setup with a 360 hooked up on it. I'm going to check it out, maybe tomorrow.
All the other stores had nearly always a PS2. One store had it with Canis Canem Edit (Bully), which looked rather good, graphically. The Xbox in that shop had Fifa Street, and even crazier, this store also still had a PSOne demo unit!!! Amazing, but I guess I could imagine that the PS2 might be around for a long time also ...
One store had a sign put up for the Wii that you could pre-order there.
I'm going to keep track of how these stores change over the holiday season, and when the Wii comes out, and so on.
Also, in most stores the DS and PSP got about the same amount of shelf space, though I only came across one DS demopod, and no PSP demopods. On the other hand, the PSP often had a bit more shelf-space for the games (no doubt partly because of the movies).
For the heck of it, I also asked if I was allowed to take pictures. In one store (Dixons) they actually called their PR manager, who asked if I would publish them. Possibly on the Web, I said, upon which I was disallowed to take pictures.